Unit_List の使用ケースその2：Google MapのAPI 「MarkerClusterer」

<script type="text/javascript" src="https://maps.google.com/maps/api/js?key=%{GOOGLE_API_KEY}&sensor=false"></script> 
<script type="text/javascript" src="/js/markerclusterer.js"></script>

MarkerClusterer.prototype.MARKER_CLUSTER_IMAGE_PATH_ = '../images/m';

<div id="map" style="height: 400px;"></div>

<h3 class="acms-admin-admin-title2">一覧ページで表示させる地図の中心の緯度経度設定</h3>
<table class="adminTable acms-admin-table-admin-edit">
<tr>
  <th>地図</th>
  <td class="js-map-editable">
    <div class="acms-admin-form-group">
      <label for="input-text-map-search_text" class="acms-admin-hide-visually">住所で検索する</label>
      <input type="text" name="" value="" id="input-text-map-search_text" class="js-editable_map-search_text" disabled="disabled" size="40" />
      <input type="button" name="" value="検索" class="js-editable_map-search_button acms-admin-btn-admin" disabled="disabled" />
    </div>
    <div class="acms-admin-form-group">
      <img class="js-map_editable-container" src="http://maps.google.com/maps/api/staticmap?center={index_map_lat},{index_map_lng}&zoom={index_map_zoom}&size=640x400&maptype=roadmap&markers={index_map_lat},{index_map_lng}&key=%{GOOGLE_API_KEY}" width="640" height="400" style="display:block;" />
    </div>
  <!-- BEGIN index_map_lat:veil -->
  <label for="input-text-index_map_lat">緯度</label> <input type="text" name="index_map_lat" value="{index_map_lat}" size="9" id="input-text-index_map_lat" class="js-map_editable-lat" />
  <label for="input-text-index_map_lng">経度</label> <input type="text" name="index_map_lng" value="{index_map_lng}" size="10" id="input-text-index_map_lng" class="js-map_editable-lng" />
  <label for="input-text-index_map_zoom">ズーム</label> <input type="text" name="index_map_zoom" value="{index_map_zoom}" size="10" id="input-text-index_map_zoom" class="js-map_editable-zoom" />
  <!-- END index_map_lat:veil -->
  <!-- BEGIN index_map_lat:empty -->
  <label for="input-text-index_map_lat">緯度</label> <input type="text" name="index_map_lat" value="35.172775" size="9" id="input-text-index_map_lat" class="js-map_editable-lat" />
  <label for="input-text-index_map_lng">経度</label> <input type="text" name="index_map_lng" value="136.887466" size="10" id="input-text-index_map_lng" class="js-map_editable-lng" />
  <label for="input-text-index_map_zoom">ズーム</label> <input type="text" name="index_map_zoom" value="7" size="10" id="input-text-index_map_zoom" class="js-map_editable-zoom" />
  <!-- END index_map_lat:empty -->
  <input type="hidden" name="field[]" value="index_map_lat" />
  <input type="hidden" name="field[]" value="index_map_lng" />
  <input type="hidden" name="field[]" value="index_map_zoom" />
  </td>
</tr>
</table>

<script type="text/javascript">
  var map = null;
  var markerclusterer = null;
  var infowindow = new google.maps.InfoWindow();
  var gmarkers = []; 
  // マーカーの作成と、吹き出しの作成
  function createMarker(latlng, info) {
    var marker = new google.maps.Marker({
      position: latlng,
      map: map
    });
    google.maps.event.addListener(marker, 'click', function() {
      infowindow.setContent(info); 
      infowindow.open(map,marker);
    });
    // 情報を保存
    gmarkers.push(marker);
  }
  // クリックイベントを作成する
  function myclick(i) {
    google.maps.event.trigger(gmarkers[i], "click");
  }
  function initialize() {
    // 全体の地図を作成
    <!-- BEGIN_MODULE Category_Field -->
    var myOptions = \{
      zoom: {index_map_zoom},
      center: new google.maps.LatLng({index_map_lat},{index_map_lng}),
      mapTypeControl: true,
      navigationControl: true,
      mapTypeId: google.maps.MapTypeId.ROADMAP
    \}<!-- END_MODULE Category_Field -->
    map = new google.maps.Map(document.getElementById("map"), myOptions);
    google.maps.event.addListener(map, 'click', function() {
      infowindow.close();
    });
    // 場所・吹き出しの情報を定義
    var markers = [
    <!-- BEGIN_MODULE Unit_List id="map" --><!-- BEGIN unit:loop -->
      ["{entry_title}", {unit_field_2},{unit_field_3},"{entry_url}"],<!-- END unit:loop -->[]<!-- END_MODULE Unit_List -->
    ];
    // 吹き出しに入れる要素
    for (var i = 0; i < markers.length; i++) {
      var point = new google.maps.LatLng( markers[i][1],  markers[i][2]);
      var marker = createMarker( point, "<div class='scrollFix'><p class='mapEntryTitle'>" + markers[i][0] + "</p> " + "<p class='mapDetailInfo'>緯度: " + markers[i][1] + "<br> 経度: "  +  markers[i][2] + "</p><p class='mapLinkText'><a href='"+ markers[i][3] +"'>詳しく見る</a></p>" + " </div>") ;
    }
    markers.pop();
    // 地図を表示
    markerCluster = new MarkerClusterer(map, gmarkers);
  }
  window.addEventListener('load', initialize);
</script>